navigator.lua/lua/navigator/hover.lua

-- TODO: change background and use TextView?
local lsp = require("vim.lsp")
return { hover_handler = function(_, method, result)
    vim.lsp.util.focusable_float(
      method,
      function()
        if not (result and result.contents) then
          return
        end
        local markdown_lines = lsp.util.convert_input_to_markdown_lines(result.contents)
        markdown_lines = lsp.util.trim_empty_lines(markdown_lines)
        if vim.tbl_isempty(markdown_lines) then
          return
        end

        local bnr, contents_winid, _, border_winid = vim.lsp.util.fancy_floating_markdown(markdown_lines)
        lsp.util.close_preview_autocmd({"CursorMoved", "BufHidden", "InsertCharPre"}, contents_winid)
        lsp.util.close_preview_autocmd({"CursorMoved", "BufHidden", "InsertCharPre"}, border_winid)
        return bnr, contents_winid
      end
    )
  end
}